v3.25.4
Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2025
Jan. 31, 2026
Jun. 30, 2025
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2025    
Document Transition Report false    
Entity File Number 1-2256    
Entity Registrant Name Exxon Mobil Corporation    
Entity Incorporation, State or Country Code NJ    
Entity Tax Identification Number 13-5409005    
Entity Address Address Line 1 22777 Springwoods Village Parkway    
Entity Address City or Town Spring    
Entity Address State or Province TX    
Entity Address Postal Zip Code 77389-1425    
City Area Code 972    
Local Phone Number 940-6000    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Document Financial Statement Error Correction [Flag] false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 460
Entity Common Stock Shares Outstanding   4,166,763,453  
Documents Incorporated by Reference Text Block Proxy Statement for the 2026 Annual Meeting of Shareholders (Part III)    
Amendment Flag false    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000034088    
Common Stock, without par value      
Document Information [Line Items]      
Security 12(b) Title Common Stock, without par value    
Trading Symbol XOM    
Security Exchange Name NYSE    
0.524% Notes due 2028      
Document Information [Line Items]      
Security 12(b) Title 0.524% Notes due 2028    
Trading Symbol XOM28    
Security Exchange Name NYSE    
0.835% Notes due 2032      
Document Information [Line Items]      
Security 12(b) Title 0.835% Notes due 2032    
Trading Symbol XOM32    
Security Exchange Name NYSE    
1.408% Notes due 2039      
Document Information [Line Items]      
Security 12(b) Title 1.408% Notes due 2039    
Trading Symbol XOM39A    
Security Exchange Name NYSE